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//-----------------------------------------------------------------------------
// Name: block_allocator.h
// Developer: Wolfire Games LLC
// Description:
// License: Read below
//-----------------------------------------------------------------------------
//
// Copyright 2022 Wolfire Games LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//-----------------------------------------------------------------------------
#pragma once
#include <iostream>
#include <string>
#include <thread>
#include <mutex>
#include <cstdint>
#include <cstring>
class BlockAlloctorThreadSafe {
private:
struct DebugAllocationData {
uint32_t line;
const char* filename;
uint32_t allocationSize;
bool watched;
bool taken;
friend std::ostream& operator<<(std::ostream& os, const DebugAllocationData& data) {
os << data.filename << "\t: " << data.line << " size: " << data.allocationSize;
return os;
}
};
uint32_t size;
uint16_t blockSize;
uint32_t nrOfBlocks;
uint32_t nr_of_allocations;
DebugAllocationData * allocations; // tracks allocations from block number in size. Rounded to blocksize
bool * bitmap; // tracks free blocks
std::mutex bitmapLock;
uint8_t * pool;
public:
BlockAlloctorThreadSafe(uint32_t size = 4096, uint16_t blockSize = 256); // size is initalize size of the avaiable pool of bytes
~BlockAlloctorThreadSafe();
uint32_t GetSize() const;
uint32_t GetNrOfBlocks() const;
//uint8_t * Allocate(uint32_t size);
uint8_t* Allocate(uint32_t size, uint32_t line, const char * file, bool watched = false);
template <class T>
void DeAllocate(T* addr);
template<class T>
void DeAllocate(T* addr, uint32_t line, const char* file);
template <class T>
T* ReAllocate(T* addr, uint32_t size);
private:
int32_t FindFirstFreeBlock(uint32_t size);
};
template<class T>
void BlockAlloctorThreadSafe::DeAllocate(T * addr) {
std::lock_guard<std::mutex> guard(bitmapLock); // we can probably do without this in overgrowth.
nr_of_allocations--;
int32_t bytesFromStart = (int32_t)((uint8_t*)addr - pool); // we need to do some magic to make sure it's on block start.
if (bytesFromStart > size || bytesFromStart < 0) {
std::cout << "YOU DE-ALLOCATED AN ADDRES THAT WAS NEVER ALLOCATED" << std::endl;
return;
}
uint32_t startOfBlock = bytesFromStart / blockSize; // maybe warning here instead of solving a potential user error
if (allocations[startOfBlock].watched) {
std::cout << " deallocated from: " << allocations[startOfBlock].filename << " line: " << allocations[startOfBlock].line << std::endl;
}
if (allocations[startOfBlock].taken) {
for (uint32_t i = 0; i < allocations[startOfBlock].allocationSize / blockSize ; i++)
bitmap[((i * blockSize) + bytesFromStart) / blockSize] = false;
allocations[startOfBlock].taken = false;
}
}
template<class T>
void BlockAlloctorThreadSafe::DeAllocate(T* addr, uint32_t line, const char* file) {
std::lock_guard<std::mutex> guard(bitmapLock); // we can probably do without this in overgrowth.
int32_t bytesFromStart = (int32_t)((uint8_t*)addr - pool); // we need to do some magic to make sure it's on block start.
if (bytesFromStart > size || bytesFromStart < 0) {
std::cout << "Deallocated line: " << line << " in file: " << file << " which where never allocated." << std::endl;
return;
}
nr_of_allocations--;
uint32_t startOfBlock = bytesFromStart / blockSize; // maybe warning here instead of solving a potential user error
if (allocations[startOfBlock].taken) {
DebugAllocationData temp = allocations[startOfBlock];
if (temp.watched) {
std::cout << " allocated from: " << temp.filename << " line: " << temp.line <<
" deallocated from: " << file << " on line " << line << std::endl;
}
for (uint32_t i = 0; i < allocations[startOfBlock].allocationSize / blockSize; i++)
bitmap[((i * blockSize) + bytesFromStart) / blockSize] = false;
allocations[startOfBlock].taken = false;
}
else {
std::cout << "No allocation where deallocated" << std::endl;
}
}
template<class T>
T* BlockAlloctorThreadSafe::ReAllocate(T * addr, uint32_t size) {
DeAllocate(addr);
return Allocate(addr, size);
}
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